nav ul li:nth-child(5) a {
  color: #c5842d;
  border-bottom: 2px solid #fff;
}

/* banner-top */
.banner-top {
  width: 100%;
  height: 13.6rem;
  background-color: #000;
  position: relative;
}

.banner-top .nav-content {
  position: absolute;
  top: 1em;
  left: 7.25em;
  width: 46.6rem;
  text-align: left;
}

.banner-top .nav-content .one {
  font-family: '黑体';
  font-size: 0.4rem;
  color: #b1b1b1;
  line-height: 1.35rem;
  margin-top: 0rem;
  width: 13.45rem;
}

.banner-top .nav-content2 {
  position: absolute;
  top: 5.52rem;
  left: 13.25rem;
  width: 38.25rem;
  text-align: center;
}

.banner-top .nav-content2 .two {
  font-family: '黑体';
  font-size: 2.5rem;
  line-height: 2rem;
  margin-top: 0rem;
}

.banner-top .nav-content2 .two a {
  color: #fff;
}

.banner-top .nav-content2 .three {
  font-family: '黑体';
  font-size: 0.85rem;
  color: #878787;
  line-height: 1.45rem;
  margin-top: 2.55rem;
}

/* bannner------------------------------------------------- */
.banner {
  width: 100%;
  height: 29rem;
  position: relative;
}

.banner .img {
  width: 100%;
  height: 100%;
  display: block;
}

/* banner-center------------------------------------------- */

.banner-center {
  width: 100%;
  padding-top: 1.55rem;
  padding-bottom: 2rem;
}

.banner-center h2 {
  font-family: '宋体';
  font-size: 2.15rem;
  color: #c5842d;
  text-align: center;
  line-height: 8.65rem;
}

.banner-center .banner_content {
  text-align: center;
  margin-left: 2.25rem;
}

.banner-center .banner_content ul {
  margin-left: 3.45rem;
}

.banner-center .banner_content ul li {
  float: left;
  margin-right: 0rem;
}

.banner-center .banner_content img {
  width: 17.25rem;
  margin-bottom: 3.45rem;
}

.banner-center .banner_content ul li .bb-text {
  position: relative;
  top: -2.75rem;
  left: -0.25rem;
  width: 18.25rem;
  text-align: center;
}

.banner-center .banner_content ul li .bb-text .one {
  font-size: 1.25rem;
  color: #000;
  line-height: 1.6em;
  margin-bottom: 1.15rem;
}

.banner-center .banner_content ul li .bb-text .two {
  font-size: 0.45rem;
  color: #8f8f8e;
  line-height: 1.45rem;
  width: 12.25rem;
  text-align: center;
  margin: 0 auto;
}

.banner-center .aa {
  display: block;
  font-family: '宋体';
  font-size: 1.05rem;
  color: #c5842d;
  text-align: center;
  line-height: 1.65rem;
  margin: 31.25rem 0 0.25rem 0;
  /* border: 1px solid #c5842d; */
  padding-bottom: 1.25rem;
}

.banner-center .aa::before {
  content: '';
  border-top: 1px solid #a0a0a0;
  width: 54.25rem;
  display: block;
  margin: 0 auto;
}

.banner-center .aa::after {
  content: '';
  border-bottom: 1px solid #a0a0a0;
  width: 54.25rem;
  display: block;
  margin: 0 auto;
}

/* bannner-center2------------------------------------------------- */
.banner-center2 {
  width: 100%;
  height: 32rem;
  background-color: black;
  position: relative;
}

.banner-center2 .img {
  width: 100%;
  height: 99.8%;
  display: block;
}

.banner-center2 .one {
  font-family: '黑体';
  font-size: 2.4rem;
  color: #fff;
  line-height: 2.25rem;
  position: absolute;
  top: 1rem;
  left: 6.35rem;
  width: 50.65rem;
  text-align: center;
  margin-top: 1.25rem;
}

.banner-center2 .banner-content {
  position: absolute;
  top: 1rem;
  left: 6.35rem;
  width: 17.65rem;
  text-align: left;
}

.banner-center2 .banner-content .two {
  font-family: '黑体';
  font-size: 1rem;
  color: #878787;
  line-height: 1.45rem;
  margin-top: 11.65rem;
}
/* banner-center3 */
.banner-center3 {
  width: 100%;
  height: 47.65rem;
  background-color: #000;
  position: relative;
  padding-top: 1.55rem;
  padding-bottom: 2rem;
}

.banner-center3 .w-list {
  margin: -15.45rem auto 0;
  position: relative;
  width: 78%;
}

.banner-center3 .w-list ul {
  width: 100%;
}

.banner-center3 .w-list ul li {
  width: 22.9%;
  height: 23.35rem;
  text-align: center;
  float: left;
  margin-left: 8.6%;
}

.banner-center3 .w-list ul li::before {
  content: '';
  position: relative;
  display: block;
  left: 13.25rem;
  top: 16.25rem;
  height: 17.25rem;
  width: 1px;
  background-color: #817979;
}

.banner-center3 .w-list ul li::after {
  content: '';
  border-bottom: 1px solid #817979;
  width: 11.25rem;
  display: block;
  margin: 0 auto;
}

.banner-center3 .w-list ul li img {
  display: block;
  margin: 0.7rem auto 0;
  height: 58%;
}

.banner-center3 .w-list ul li img:hover {
  background-color: #000;
  box-shadow: 0 0 7px 3px #51c5e9;
}


.banner-center3 .w-list ul li:nth-child(4) img {
  display: block;
  position: relative;
  top: -4.55rem;
  left: -4.05rem;
  margin: 0 0px -7.75rem 0;
  height: 100%;
}

.banner-center3 .w-list ul li p {
  font-size: 0.6rem;
  color: #878787;
  line-height: 1.67em;
  margin: 0.4rem 0 2.25rem 0;
}

.bar {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 2.1rem;
}

.bar li {
  float: left;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background-color: #6c6c6c;
  margin-left: 0.85rem;
}

.bar li:first-child {
  background-color: #fff;
  margin-left: 0;
}

.bar li:hover {
  background-color: #fff;
  box-shadow: 0 0 7px 3px #e2e3e2;
}

/* banner-bottom-------------------------------------------- */
.banner-bottom {
  width: 100%;
  padding-top: 1.55rem;
  padding-bottom: 2rem;
}

.banner-bottom .banner3_content {
  text-align: center;
  margin: 2.25rem 3.25rem 0.25rem 3.25rem;
}

.banner-bottom .banner3_content img {
  width: 90%;
  margin-bottom: -4.45rem;
}

.banner-bottom .banner3_content ul li:nth-child(3) img {
  margin-bottom: -9.45rem;
  margin-top: 2.25rem;
}

.banner-bottom .banner3_content ul li .bb-text {
  position: relative;
  top: -3.75rem;
  left: 7.75rem;
  width: 18.25rem;
  text-align: left;
}

.banner-bottom .banner3_content ul li .bb-text p {
  font-size: 1.4rem;
  color: #fff;
  line-height: 1.6em;
}

.banner-bottom .banner3_content ul li .bb-text a {
  display: block;
  width: 8.35rem;
  height: 1.9rem;
  text-align: left;
  line-height: 1.9rem;
  color: #c5842d;
  font-size: 0.85rem;
  margin: 0.75rem 0 0 0;
}

.banner-bottom .banner3_content ul li .cc-text {
  width: 24.25rem;
  height: 9.25rem;
  background-color: black;
  opacity: .65;
  font-size: 1.65rem;
  color: #fff;
  line-height: 3.6em;
  position: relative;
  top: -6.75rem;
  left: 18.25rem;
}

.banner-bottom .banner3_content ul li .cc-text .min {
  font-size: 0.95rem;
  position: relative;
  top: -3.25rem;
  left: 0.15rem;
}

.banner-bottom .return-top {
  text-align: center;
}

.banner-bottom .return-top button {
  width: 3.75rem;
  height: 1.45rem;
  background-color: #9c9c9c;
  margin-bottom: 1.25rem;
  position: relative;
  top: 1.25rem;
}

.banner-bottom .return-top button a {
  color: #fff;
  font-size: 0.15rem;
}

/* bannner-bottem2------------------------------------------------- */
.banner-bottom2 {
  width: 100%;
  height: 19rem;
  background-color: black;
  position: relative;
}

.banner-bottom2 .img {
  width: 100%;
  height: 99.8%;
  display: block;
}
.banner-bottom2 .banner-content {
  position: absolute;
  top: 1rem;
  left: 6.35rem;
  width: 17.65rem;
  text-align: left;
}

.banner-bottom2 .banner-content a {
  display: block;
  width: 8.35rem;
  height: 1.9rem;
  text-align: left;
  line-height: 1.9rem;
  color: #c5842d;
  font-size: 0.85rem;
  margin: 10.75rem 0 0 3.65rem;
}


.clear {
  width: 100%;
  padding-top: 1px;
}